Isolation valve for the safety valve of liquid chlorine pipelines
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Can a shut-off valve for the safety valve on the liquid chlorine pipeline be replaced with a dedicated chlorine stop valve? Clause 4.1.8 of GB/T20801.6-2006 states that the shut-off valve for safety valves should be a full-bore valve, but globe valves are not full-bore valves.
There’s another half-sentence after that; perhaps it says that the pressure drop will not affect the proper functioning of the safety relief device or the required amount of discharge, but it’s not clear
In other words, either use valves with full flow passage, or calculate the pressure drop through process calculations
There is no problem with the stop valves for liquid chlorine; those for liquid ammonia are fine. The liquid ammonia stop valve is full-bore. When purchasing, pay attention to the material of the valve seat; proper sealing of the valve stem is sufficient.
Is the liquid chlorine stop valve full-bore? Isn’t its structure similar to that of a regular stop valve?